2012 civic wiring diagram

I'm looking to install a Directed Electronics 545T Nite-Lite System in my 2012 Civic Sedan LX and would like some help finding a wiring diagram.   Any help would be appreciated. Thanks.

Are you looking for a 545t diagram or the car's diagram?

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

I'm not sure of the exact name of what I'm looking for. All I really want to know is which wires under the steering column (or similar location) control the wires that are required for the nite lite system. Here's a pdf of the installation manual, and the important requirements are on page one: https://www.directeddealers.com/manuals/ig/accessories/254521_545T_OK-7I_to_current_Installation_Guide.pdf.

I think the major wires I need to locate are: Headlight input, headlight output, parking (brake) lights input, parking (brake) lights output, constant power input, and wiper switch input. Any help would be much appreciated! Thanks!

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2012 Civic Sedan LX

     Headlights-Lo          BLUE/RED     (-)          LIGHT SWITCH HARNESS
     Headlights-Hi          ORANGE / WHITE     (-)          LIGHT SWITCH HARNESS
     LF Pk Lt Bulb          RED / BLACK     (+)          AT FRONT LEFT PARKING LIGHT
     RF Pk Lt Bulb          RED / BLACK     (+)          AT FRONT RIGHT PARKING LIGHT
     LR Pk Lt Bulb          RED / BLACK     (+)          AT REAR LEFT PARKING LIGHT
     RR Pk Lt Bulb          RED / BLACK     (+)          AT REAR RIGHT PARKING LIGHT
     Wipers-Lo          BLUE     (-)          IN HARNESS UNDER LEFT SIDE OF DASH
     Wipers-Hi          BLUE / YELLOW     (-)          IN HARNESS UNDER LEFT SIDE OF DASH
     Parking Brake          GREEN/ RED     (-)          AT PRAKING BRAKE SWITCH
     Trnk Release          WHITE     (+)          AT DRIVER SIDE FUSEBOX

Above are for 2011 model. If not the same get out your DMM and test.
Power in will be a white primary colour, except notice they are negative going.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

Wipers input,pos feed ignition on at the switch.

Parking brake output will either be at a switch at the handbrake base or ignition panel. There is no input it goes to ground.
Do you mean foot brake? Input and output are either wire at the brake switch.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

Thank you very much! By "parking brake output", I meant the brake lights that come on when the headlights come on. Parking lights is what the installation guide calls those lights. What about a constant 12V power supply? Is there a wire under the dash that I can tap into? Thanks again for all of your help, hopefully Honda hasn't changed much from 2011 to 2012. In your experience, do they change the wiring colors much from year to year?

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2012 Civic Sedan LX

Actually parking or side lights are different beasts, 5-10 watts from brake lights which are 21 watts and indicator lights on all but US build cars which are amber and 21 watts.
The answer as I've already given you is anything with a white primary colour but TEST.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

So I've opened up the dash and looked at the wires that I'm going to be connecting to. I've posted pictures below:

This is a picture of the wires leading to the signal indicator (which has the on/off switch for the headlights):



As you can see, the color options for the headlights are Red, BLACK/ Silver, Blue, Brown, Green, Purple, Gray/Silver, Orange, and Pink/Silver. Any idea which one is the headlights-lo beam? The gray, pink, and black wires appear to be a larger gauge than the rest, don't know if that has any effect on your analysis. Do you think the wires in the car correspond properly to the colors in the Nite Lite system?

This is a picture of the wiring harness for the wipers:



The color options for this harness are BLACK/ silver, Green, Orange, Yellow/silver, and white.

I appreciate any insight you might have. Do you know if there is a diagram anywhere on the internet that can tell me what each of these wires do? (i.e., pink=right indicator, green=left indicator, etc. (obviously I don't know if that is really how the colors match up, I was just giving examples of what I'm looking for)). Thanks!

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2012 Civic Sedan LX

TEST

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

That truly is not helpful. If you don't know, just say so.

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2012 Civic Sedan LX

Ok, I have found the ignition (blue wire not pictured), and the constant 12V (white wire not pictured) by testing the wire with a DMM. This is probably a very novice question, but how can I test the smaller wires pictured above without cutting the wires? I can't seem to get the DMM tip into the wiring harness like I could with the larger gauges in the constant and ignition wires. Any suggestions would be greatly appreciated. Thanks.

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2012 Civic Sedan LX

As a pro with 40+ years experience I can tell you that that's what I'd do in fact if I'm right you don't even need those two relays also from your questions I don't think you should do this job, you don't appear to have any knowledge of how to go about this. If in doubt test.
I wish you luck.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

I understand you're a pro with over 40 years of experience, which is why I'm asking you rather than simply attempting this on my own. How would you test a small-gauged wire? You still haven't answered that basic question. I understand, you use a DMM, and I also understand that you know more about cars than I do, but this is a basic question. I'm obviously not going to cut any wires, but I can't get the metal tip of the DMM down into its connection in the harness. Please help me by telling me how to test a small-gauge wire where the tip of the DMM won't reach into the small connection port in the harness. Do I need to change testing locations from the steering column down to the larger panels of wires by the driver-side door?   Thank you.

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2012 Civic Sedan LX

There are two ways:
a) The correct way is to obtain a "bed of nails" adaptor for the test lead.
b) The quick and dirty method, a "traditional" grey metal Stanley knife, test probe in lanyard hole then very carefully slice into the cable.
I actually prefer method b.
Test initially with your probe to 20VDC, black lead to ground, red to each wire then turn to low beam.
If you don't get a reading, place red end on a confirmed 12V+ source, remember what I said before about NEG pulse.
Also I've a hunch your wiper feeds are also NEG.


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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

Here is a picture of the "Bed of Nails" type test lead Howard mentioned.  

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Soldering is fun!

Honda Civic 2012 LX 4 doors

I want to install a Window Auto Rollup Module. I've done it before on my Civic 2003 but now I want to add one to my Civic 2012. I need to cut 4 wires (4 windows). I need to insert the module between the "window motor UP" and the "Window switch".
Question 1:
Where can I found those 4 wires. In the driver's door or in the dashboard ?
Question 2:
Where can I found the wiring diagram (with color codes) of those wires ?

Thank you and have a nice day !


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Honda Civic LX 2012 4 doors

Find the two wires going to the motors in each door. Both will be 0v at rest, one will go to 12v+ on window raise will the other stays at 0v. The one going to 12v+ is the one you cut. Or test in the driver's kick well or door switch. The wire you're looking for has to go to 12v+ from 0v on window raise.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

Thanks Howie, I will try that. I checked with my dealer and the 2012 shop manual is not even available on Honda's web site yet.

This module can be install under the dash but needs the wires (+12v Passenger wire going to the window motor) which is in the passenger door only.

I took a look at the hole where the wires go from the body to the driver's door and don't see how I can pass a wire or two between the door and the body. The wires ends of the body ends in the hole with a connector and the wire comming from the door are equiped with a connector.

So my only chance is to install the Auto up module in the door where I have the 4 window's +12V wire AND hope there's a "constant +12V" and the "lock (+) or (-)" also in the door wich my module need.

Thank You

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Honda Civic LX 2012 4 doors

Ah, the nitty gritty of Hondas, getting into the doors. Pull those Molex plugs and drill them out.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.